When exposed to elevated temperatures, which type of polymer can be reshaped and will return to its original form once cooled?

Thermoplastic polymers can be reshaped when heated above a certain temperature; they soften, allowing the material to be molded or stretched. When the temperature drops, the polymer chains become locked again in their original configuration, so the material returns to its former shape. This behavior happens because the polymer’s chains can move freely at high temperatures but become rigid once cooled. For example, a plastic bottle can be heated until it melts, reshaped, and then cooled to form a new bottle that looks like the original.